Adjustable desk lamp



FIG. 1 is a top, front, right side, perspective view of an adjustable desk lamp showing my new design;

FIG. 2 is a front view thereof on an enlarged scale;

FIG. 3 is a rear view thereof on an enlarged scale;

FIG. 4 is a left view thereof on an enlarged scale;

FIG. 5 is a right view thereof on an enlarged scale;

FIG. 6 is a top view thereof on an enlarged scale; and,

FIG. 7 is a bottom view thereof on an enlarged scale. 

The ornamental design for adjustable desk lamp, as shown and described. 